New Libraries

• Bloom: Bloom filters, from Joaquín M López Muñoz.

Updated Libraries

* [phrase library..[@/libs/any/ Any]:]
  * [*Initial support for C++20 Modules]. See the docs for more info.

• Beast:

  • Fixes

    • Conditionally defined immediate_executor_type in async_base.
    • Added missing cstdint header to detail/cpu_info.hpp.
    • Fixed std::is_trivial deprecation warnings.
    • handshake_timeout now applies to closing handshakes during reads.
  • Improvements

    • Replaced detail/work_guard.hpp with net::executor_work_guard.
    • Fixed portability issues for building tests in MinGW.
  • Documentation

    • Removed moved sections from documentation.
    • Removed superfluous log messages from tests.
  • Acknowledgements

    • yliu1021
• Compat:

  • Added move_only_function.hpp.
• ContainerHash:

  • Added the hash_is_avalanching trait class.
• Conversion:

  • Added an ability to use polymorphic_downcast and polymorphic_cast in constexpr (requires C++20).
• DLL:

  • Fixed compiling and exporting on Cygwin. Many thanks to Luohao Wang for the PR!
  • Fixed building on FreeBSD. Thanks to ash for the bug report!
  • Added BOOST_DLL_USE_STD_FS CMake option to match the preprocessor option. Thanks to Yury Bura for the PR!
• Hash2:

  • Added Blake2 algorithm (blake2s_256, blake2b_512).
  • Added XXH3 algorithm (xxh3_128).
• MySQL:

  • The caching_sha2_password authentication plugin can now be used without TLS. This is the default in MySQL 8 and above. Plaintext connections that attempt to use this plugin no longer fail with client_errc::auth_plugin_requires_ssl (#313).
  • Fixed a problem causing client_errc::incomplete_message to be returned during connection establishment when the target database does not exist and the caching_sha2_password is used. The appropriate server-generated diagnostic is now returned. See issues #468 and #488.
  • The handshake algorithm is now more resilient to protocol violations (#469).
  • Fixed a build failure with gcc-15 due to a missing include (PR#475). Thanks hhoffstaette for the PR.
  • Added benchmarks against the official drivers.
  • Optimized metadata representation to be faster to construct and take less memory (#461).
• PFR:

  • Rewrite C++20 module following the new recommended Boost practice. See the docs for more info.
  • Fixed C++26 compilation on modern clang compilers. Thanks to Valery Mironov for the report!
  • Support types that use 'Arrays of Length Zero' compiler extension.
  • Fixed typos. Thanks to Egor for highlighting the issues!
  • Return std::array<std::string_view, 0> type for boost::pfr::names_as_array(empty_struct{}) to allow compilation of for (std::string_view name : boost::pfr::names_as_array(empty_struct{})). Many thanks to sabudilovskiy for the bug report!
• TypeIndex:

  • Initial support for C++20 Modules. See the docs for more info.
• Unordered:

  • Deprecated boost::unordered::hash_is_avalanching is now a using-declaration of boost::hash_is_avalanching in <boost/container_hash/hash_is_avalanching.hpp>. Use that header directly instead. <boost/unordered/hash_traits.hpp> will be removed in the future.
  • Added pull(const_iterator) to open-addressing containers. This operation allows for efficient removal and retrieval of an element via move construction.
• Histogram:

  • Update CMake minimum version and Python detection in CMake
  • Improve documentation

    • Add example on how to make an axis which accepts multiple value types that are not implicitly convertible
    • Show how to use histogram::fill with a multidimensional histogram efficiently when data per dimension is already available as contiguous data
  • Don't use deprecated form of user-defined literal operator
  • Add support for modular build structure with b2
  • Fixed warnings in MSVC about narrowed types
  • Added collector accumulator, which stores all values in a bin
  • Internal changes to tests and classes in detail namespace

Updated Tools

• Build:

  • Includes release of B2 version 5.3.2.

Compilers Tested

Boost's primary test compilers are:

• Linux:

  • Clang, C++03: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0, 13.0.0, 14.0.0, 15.0.0
  • Clang, C++11: 3.4, 11.0.0, 13.0.0, 14.0.0, 15.0.0
  • Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
  • Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
  • Clang, C++20: 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
  • GCC, C++03: 4.6.3, 11, 12
  • GCC, C++11: 4.7.3, 4.8.5, 11, 12
  • GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11, 12
  • GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11, 12
  • GCC, C++20: 8.0.1, 9.1.0, 10, 11, 12
• OS X:

  • Apple Clang, C++03: 11.0.3
  • Apple Clang, C++11: 11.0.3
  • Apple Clang, C++14: 11.0.3
  • Apple Clang, C++17: 11.0.3
  • Apple Clang, C++20: 11.0.3
• Windows:

  • Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2, 14.3

Acknowledgements

Marshall Clow, Glen Fernandes and Ion Gaztañaga managed this release.